Balanced slide-valve



(No Model.)

J. O. ASKREN. BALANCED SLIDE VALVE.

Patented Sept. 24, 1889.

unul iii Ill! 'liiilagl mm 72 S (J/Ghoul UNITED STATES PATENT OFFICE.

JAMES C. ASKREN, OF BEDFORD, IOlVA.

BALANCE D SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 411,754, dated September 24, 1889. Application filed December 21, 1888. Serial No. 294,320. (No model.)

To all whom it may concern.-

Be it known that 1, JAMES C. ASKREN, a cit-izen of the United States,-residing at Bedford, in the county of Taylor and State of Iowa, have invented a new and useful Improvement in Balanced Slide-Valves, of which the following is a specification.

My invention relates to an improvement in balanced slide-valves for locomotives and other reciprocating steam-engines; and it consists in the peculiar construction and combination of devices, that will be more fully set forth hereinafter, and particularly pointed out in the claim.

In the drawings, Figure 1 is a side elevation of a valve embodying myimprovenients, showing the same arranged in the steanrchest of anengine, the said chest being indicated by dotted lines. Fig. 2 is a vertical sectional view of my improved valve. Fig. 3 is a top plan view of the same. Fig. 4 is a detail perspective view of the hood. Fig. 5 is a detail sectional view taken on the line so a; in Fig. 3.

A represents the valve, which is located in the steam-chest a of a locomotive or other steam-engine, and is adapted to slide back and forth therein in the usual manner. 0n the upper side of this valve is a rectangular shoulder B, with which engages a yoke O. The said yoke is provided with a rod D, which constitutes the valve-rod, which extends through a stuffing-box in the front end of a steam-chest, and is connected to the eccentric of an engine in the usual manner.

E represents a circular disk, which is arranged on the upper side of the valve, at the center thereof, and is secured on the valve by means of a pair of bolts F, the lower ends of which extend into the exhaust-cavity in the lower side of the valve, and are provided with nuts G, which engage the roof of the said cavity. In the upper side of the disk E is a circular opening H, in which is fitted a circular packing-disk I, which is made of cork or other suitable material. On the under side of the disk E are a pair of transverse grooves K. L represents a pair of flat springs, which are arranged on the upper side of the valve, and have their ends bearing upward in the ends of the groove K.

L represents an annular ring, the interior diameter of which is equal to the diameter of said tongue or link is firmly secured in one of the grooves, and is free to work back and forth in the other as the ring is compressed or expanded.

T represents a hood, which is formed from a piece of sheet or plate metal bent in the manner shown in Fig. 4:, so as to provide the supporting-plates U at its sides, which rest upon the bottom of the steanrchest and support the hood above the valve, with the ring L, and the packing-disk I of the latter bearing against the under side of the hood. On the upper side of the hood is secured the central portion of a fiat semi-elliptic spring V, the ends of which bear under the top of the steamchest, and therebypress the latter firmly downward on the annular ring and the packing-disk of the valve, so as to eifect steam-tight joints therewith, and thereby prevent steam from getting between the hood and ring and packing-disk, and hence serving to balance the valve and prevent excessive down Ward steampressure thereon.

It will be seen that by my invention the circular countersunk disk E may be readily attached to an ordinaryslide-valve by planing or filing the top of the same down to a level smooth surface, parallel to the under or hearing face, and drilling the necessary holes for the passage of the bolts F.

The operation of the device will be readily understood. The hood T is so constructed and arranged as to be subjected to the pressure of the steam contained in the valve-chant her on both its upper and under sides. The packing-ring K is forced by the action of the springs L in an upward direction against the under side of the hood, thus making a steamtight joint and preventing access of the steam to that portion of the upper side of the valve which is surrounded by the said ring, and relievin g the upper side of the valve of pressure to that extent. The spring V serves to keep the hood in place and to assist in making the steam-tight joint between said hood and the packing-ring.

Having thus described my invention, I claim- The combination of the s1ide-va1ve,the circular countersunk disk secured on the upper side of the same, the packing-disk seated in said countersunk disk, the packing-ring surrounding the latter, the springs interposed be tween the circular countersunk disk and the body of the Valve and having upturned ends bearing against the under side of the pack- JAMES C. ASKREN. i/Vitnessesz CALVIN G. AsKREN, GEORGE H. BAILEY. 

